JPS5887954A - Signal transmission system using telephone line - Google Patents

Abstract

PURPOSE:To control the device provided at a telephone set, by providing a high voltage pulse transmission means for a private branch exchange, and a means detecting and discriminating the pulse for telephone sets. CONSTITUTION:In operating checkout at a console MRCON of a hotel, a central controller CPU checks a line circit LC of a telephone set of a corresponding guest room, and when a telephone set is not busy, the line circuit LC is connected to a power control trunk PCT via a channel switch SW. Then, the power off information is given from the CPU to the PCT. The trunk PCT converts the power off information into a series of pulses and transmits pulse signals having higher voltage than that for channel supply to the telephone set. This signal pulse is detected at a detector DET installed in a telephon set TEL of a guest room, and when it is discriminated as the power off signal, the power relay PR is turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal transmission method using a telephone line, particularly to a signal transmission method between a private telephone exchange and a telephone terminal.

Conventionally, when a private branch exchange (hereinafter referred to as PBX) side controls a telephone-compatible device, such as turning on or off the air conditioner in a guest room at a hotel, a control line separate from the telephone line has been used. Ta.

However, this method requires a separate cable to be run between the PBX and the guest room, and it is often difficult to add the above-mentioned functions to the cable installation, especially when adding the cable later.

The present invention achieves this economically without laying new cables by using the communication line between the PBX and the telephone as a control line for turning on and off the equipment in the cabin, for example. It shall be one piece.

According to the present invention, means for sending a DC pulse signal of a voltage higher than the voltage for supplying communication current is provided on the private telephone exchange side, and means for detecting the pulse signal is provided on the telephone side, and the means for detecting the pulse signal is provided on the telephone side so that the pulse signal from the private branch exchange corresponds to the telephone set. A signal transmission system using a telephone line is obtained, which is characterized in that it controls the equipment that is connected to the telephone line.

Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a block diagram of an embodiment of the present invention Fig. 2 is a block diagram of an example of its detailed configuration. Information resulting from this operation is sent to the device CPU. Ima Hotel Connor M
When the RCON performs a recheck-out operation, the central control unit CPU checks the line circuit LC of the telephone in the corresponding guest room and confirms that the telephone is empty.

If the corresponding line circuit LC is empty, this line circuit L
C is connected to the power control trunk PCT via the communication path switch SW. It is assumed that the necessary number of power control trunks PCT are installed depending on the call volume.

The central control unit CPU is the power control trunk PC
When T is captured and a connection is made to the corresponding line circuit LC via the communication path switch SW, the central control unit CPU sends power-off information to the power control trunk PCT. The power control trunk PCT converts this power-off information into a series of pulses and sends a pulse signal of a higher voltage than the voltage for supplying communication current to the telephone side.

This signal pulse is received by a detector DET installed in each telephone equipment in the guest room, and when it is identified as a power-off signal, the power relay PR is turned off.

The power relay PR is connected to the CL-1 refrigerator, etc., and the power to these is forcibly cut off.

In the above explanation, if the corresponding extension is busy or the power control trunk PCT is in use when you check out from the hotel console MRCON, you will have to wait until the extension and trunk are empty, or the trunk will become empty. The above control is repeated at fixed time intervals until.

The above will be explained in more detail with reference to FIG.

The steps up to connecting the line circuit LC and power control trunk PCT via the communication path switch SW are omitted because they are known means.

Power controller 2-link PCT is central controller CP
When power-on or power-off information is received from U, it is held in the holding circuit HLD and sent to the sender circuit SND. The sender circuit SND converts information from the central control unit CPU into a series of pulses to turn the A relay on and off.

The contacts of the A relay are inserted into the A and B lines of the communication line, and the operation of the A relay applies +50V to the A line and -48V to the B line.
Send out. That is, in the AIJ relay off state, there is no voltage between the A line and the B line, but when the A relay is on, 98V (hereinafter referred to as a high voltage signal) is applied between the A line and the B line. While the line circuit LC is connected to the power control trunk PCT, the line relay L (not shown) is on, so the high voltage signal of 98V passes through the line circuit and is sent to the telephone side.

A neon tube N is connected to the telephone circuit between the A line and the B line through the break contact of a hook switch HK. When the above-mentioned high voltage signal is received in an off-hook state, the neon tube N blinks. Since this high voltage signal is a direct current, the level of the telephone will not ring. A light receiving element is added to the neon tube N, and the neon tube 5 is connected to the counter CON.

When the high voltage signal pulse from the power control trunk PCT is received by the above circuit, the pulse is counted by the counter CON, and when the count value reaches a predetermined value, power on and power off are identified. When the power is on, the power relay PlO can control various devices.

In the above explanation, it was explained that the neon tube N in the telephone circuit blinks due to the high voltage signal from the power control trunk PCT, but the neon tube is generally also blinked due to the ringing signal sent from the line circuit LC, so the power is turned on and off. In order to distinguish the signal from the ringing signal shown in FIG. 3(a), the pulse width and speed of the high voltage pulse are changed from the ringing signal shown in FIG. 3(b).

That is, generally, the ringing signal is on for 1 second and off for 2 seconds as shown in Fig. 3(b), and has a frequency of 16 Hz.
Since this is an alternating current signal, the neon tube turns on and off in the same way. Therefore, in order to distinguish it from this ringing signal, please refer to Figure 3 (for example, 100m5
For example, if the pulse width is set to , and the count value is more than 16 pulses in the case of ringing, it is sufficient to set the power-on to 20 pulses and the power-off to 25 pulses.

In the above explanation, an example in which a high voltage signal is sent out from the trunk PCT via a communication path switch has been described. Send a signal. FIG. 4 shows a block diagram of an embodiment in this case,
Similar to the case from the power control trunk PCT, power on/off information is received from the central control unit CPU, and when held by the holding circuit HLD, it is sent to the sender circuit SND. On the other hand, information from the central control unit CPU passes through the accommodation device information latch Q and the accommodation device information expansion network P to the PC of the line circuit.
Activate the relay and use the contact PC! and B wire to the power supply side. When the A relay connected to the sender circuit SND turns on and off in the same way as the A relay of the power control trunk 7-PCT, +5 is applied to the A line.
A high voltage signal of -48V is sent to the 0V and B lines.

As explained above, the present invention makes it possible to economically control telephone-compatible equipment by using a telephone line as a signal line between a PBX and a telephone.

[Brief explanation of drawings]

Figure 1 is a block diagram of an embodiment of the present invention, Figure 2 is a detailed configuration diagram of that example, and Figures 3 (a) and 3 (b) are waveform diagrams of an example of a signal used in the present invention and a conventional ringing signal. , 4th
The figure shows a block diagram of another embodiment of the invention.

Claims (1)

[Claims] A means for transmitting a pulse signal with a voltage higher than the voltage for supplying communication current is provided on the private branch exchange side, and a means for detecting the pulse signal is provided on the telephone side, and equipment provided for the telephone is controlled by the pulse signal from the private branch exchange. A signal transmission method that uses telephone lines.